Apparatus and method for monitoring dielectric constant of a substrate
a dielectric constant and substrate technology, applied in the field of radio frequency (rf) systems, can solve the problems of limiting the application and affecting the performance of the antenna and the rf front end
Active Publication Date: 2020-07-28
VEONEER US LLC
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Benefits of technology
This approach provides accurate and precise dielectric constant monitoring with reduced costs and time, minimizing the impact of fabrication tolerances and allowing for efficient testing of multiple boards, while maintaining high precision and accuracy comparable to conventional methods.
Problems solved by technology
Many such RF substrates have not been thoroughly characterized at such frequencies, and, due to manufacturing or processing tolerances, can vary in their center values, which can significantly affect the performance of antennas and the RF front end.
Currently used resonators or transmission lines require sensitive ground-signal-ground (GSG) probing devices, which limit their application due to cost and time required to perform such sensitive probing measurements.
Method used
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[0032]According to the present disclosure, one or more metallic or otherwise conductive patterns, such as, for example, split ring resonator patterns, are formed on every manufactured board. This configuration utilizes the distinct return loss features due to interaction of the metallic part of the rings with the substrate to characterize the dielectric constant of the substrate and monitor variations in dielectric constant from board to board. In the configuration of the disclosure, an open-ended waveguide, e.g., a WR12 waveguide, is used to capture the return loss response of the ring. In this particular exemplary embodiment, a WR12 waveguide is selected because it is suited for use at a particular frequency range of interest, for example, 76-77 GHz band. It will be understood that in other frequency ranges, other waveguides may be used.
[0033]According to the present disclosure, the split-ring resonators are excited by being exposed to the open end of the waveguide, e.g., the WR12...
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Abstract
A system for monitoring dielectric constant of a substrate includes a resonator structure formed on a surface of the substrate. A distal end of a waveguide is coupled to the resonator structure and spaced apart from the resonator structure such that a gap is provided between the distal end of the waveguide and the resonator structure. An excitation energy is coupled to the resonator structure out of the waveguide, and a response energy from the resonator structure is coupled into the waveguide and is detected at a proximal end of the waveguide. A detector detects the response energy received at the proximal end of the waveguide and generates a signal indicative of the detected response energy. A processor is coupled to the detector for receiving the signal indicative of the detected response energy and processing the signal to determine dielectric constant of the substrate.
Description
BACKGROUND[0001]1. Technical Field[0002]The present disclosure is related to radio frequency (RF) systems and, more particularly, to a system and method for monitoring dielectric constant of a printed circuit board on which one or more RF components and / or subsystems are mounted.[0003]2. Discussion of Related Art[0004]In RF systems, it is important to monitor the dielectric constant characteristics of the RF substrates used in high-frequency applications, including, for example, 77 GHz radar systems. Many such RF substrates have not been thoroughly characterized at such frequencies, and, due to manufacturing or processing tolerances, can vary in their center values, which can significantly affect the performance of antennas and the RF front end. Currently used resonators or transmission lines require sensitive ground-signal-ground (GSG) probing devices, which limit their application due to cost and time required to perform such sensitive probing measurements.SUMMARY[0005]According t...
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IPC IPC(8): G01R27/26
CPCG01R27/2623
Inventor AHMADLOO, MAJID
Owner VEONEER US LLC